Importance

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Abstract

Cell controllers provided to control modules each constituted of a plurality of cells each calculate deterioration factors indicating the extents to which the cells under its control have become depleted and detect the deterioration factor of the cell in the most advanced state of depletion. The cell controller provided at the uppermost stage transmits the detected deterioration factor to the cell controller at the next stage. The subsequent cell controllers connected at the stages succeeding the uppermost stage each compare the deterioration factor detected therein and the deterioration factor transmitted from the cell controller at the proceedings stage and transmits the deterioration factor with the smaller value to the cell controller at the next stage. The cell controller at the lowermost stage, too, executes the processing described above and transmits the deterioration factor with the smaller value to a battery controller. The battery controller judges with regard to a cell abnormality based upon the deterioration factor transmitted thereto.

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First Claim